Mercury Mariner Outboard 70 HP Service Repair Manual

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    30-Jul-2020
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Transcript of Mercury Mariner Outboard 70 HP Service Repair Manual

  • GENERAL INFORMATION AND SPECIFICATIONS 1

  • 90-13645-2 495

    Table Of Contents Page Page

    General Specification 1-1. . . . . . . . . . . . . . . . . . . . . . Cowl Removal 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . Filling Oil Injection System 1-3. . . . . . . . . . . . . . . . . . Power Trim General Information 1-4. . . . . . . . . . . . . Trim “In” Angle Adjustment 1-4. . . . . . . . . . . . . . . . .

    Models with Power Trim 1-4. . . . . . . . . . . . . . . . Checking Trim System Fluid Level 1-5. . . . . . . . . . . Tilt Angle Adjustment 1-5. . . . . . . . . . . . . . . . . . . . . .

    Models without Power Trim 1-5. . . . . . . . . . . . . . Connecting Engine Wiring Harness and

    Routing of Engine Battery Cables 1-6. . . . . . . . Ride-Guide Steering Cable and

    Pivot Points Lubrication 1-7. . . . . . . . . . . . . . . . .

    Following Complete Submersion 1-8. . . . . . . . . . . .

    Salt Water Submersion (Special Instructions) 1-8. . . . . . . . . . . . . . . .

    Submerged While Running (Special Instructions) 1-8. . . . . . . . . . . . . . . .

    Submerged Engine (Fresh Water) (Plus Special Instructions) 1-8. . . . . . . . . . .

    Out-of-Season Outboard Storage 1-9. . . . . . . . . . .

    How Weather Affects Engine Performance 1-10. .

    Conditions Affecting Operation 1-11. . . . . . . . . . . . .

    Detonation: Causes and Prevention 1-12. . . . . . . .

    Compression Check 1-12. . . . . . . . . . . . . . . . . . . . . .

  • 1-190-13645--2 1095 GENERAL INFORMATION AND SPECIFICATIONS

    General Specification NOTE: Other specification (torques, etc.) are listed in the respective sections.

    Model 70 Model 75 Model 80 Model 90

    Horsepower 70 (52.2 kw) 75 (55.9 kw) 80 (59.6 kw) 90 (67.1 kw)

    Idle RPM (in forward gear) 650 - 700

    Full Throttle RPM Range 4750 - 5250 5000 - 5500

    Piston Replacement 71.12 (1165.7cc)

    Cylinder Bore 3.375 (85.7mm)

    Stroke 2.65 (67.3mm)

    Engine Type 3 Cylinder, 2 Cycle

    Ignition Type C.D. Breakerless

    Recommended Spark Plug NGK-BUHW-2 or AC-V40 FFK or Champion L78V

    Inductor Plugs: NGK-BUZHW-2 or Champion QL78V

    Cylinder Firing Order 1-3-2

    Recommended Power Trim Fluid Quicksilver Power Trim & Steering Fluid or Automotive Transmission Fluid (ATF) Type F, FA or Dexron II

    Recommended Gasoline Regular Leaded, Premium, Low-Lead and Lead-Free automotive gaso- lines with a minimum pump posted octane rating of 86

    Recommended Oil Quicksilver TC-WII or TC-W3 2-Cycle Outboard Oil

    Engine Weight ELO ELOPT

    260 lbs. 280 lbs.

    Fuel Tank Capacity 6.6 U.S. Gallons (5 Imp. Gals.; 25 Liters)

    Gear Housing Lubricant Capacity 22.5 fl. oz. (665.3ml)

    Gasoline/Oil Ratio at Idle 80:1

    Gasoline/Oil Ratio at W.O.T. 50:1

    Gear Ratio 2.3:1

    Oil Injection Tank Capacity

    Tank Capacity 1 gal. (3.78 liter)

    Maximum operation per tank full of oil at W.O.T.

    6 hours

    Oil remaining when warning buzzer sounds

    1 qt. (.95 liter)

    Operating time remaining at wide open throttle when warn- ing buzzer sounds

    1 Hour

  • 1-2 90-13645--2 1095GENERAL INFORMATION AND SPECIFICATIONS

    General Specification (continued) NOTE: Other specification (torques, etc.) are listed in the respective sections.

    Model 100 Model 115

    Horsepower 100 (74.6 kw) 115 (85.8 kw)

    Idle RPM (in forward gear) 650 - 700

    Full Throttle RPM Range 4750 - 5250

    Piston Replacement 105 (1720.9cc)

    Cylinder Bore 3.375 (85.7mm)

    Stroke 2.930 (74.4mm)

    Engine Type 4 Cylinder, 2 Cycle

    Ignition Type C.D. Breakerless

    Recommended Spark Plug NGK-BPH8H-N-10* Gap - 0.040 in. (1.0mm)

    Inductor Plug NGK BPZ 8H-N-10* Gap - 0.040 in. (1.0mm) NGK-BUHW

    Cylinder Firing Order 1-3-2-4

    Recommended Power Trim Fluid Quicksilver Power Trim & Steering Fluid or Automotive Transmission Fluid (ATF) Type F, FA or Dexron II

    Recommended Gasoline Regular Leaded, Premium, Low-Lead and Lead-Free automotive gaso- lines with a minimum pump posted octane rating of 86

    Recommended Oil Quicksilver 2-Cycle Outboard Oil

    Engine Weight ELO ELOPT

    340 lbs. 360 lbs.

    Fuel Tank Capacity 6.6 U.S. Gallons (5 Imp. Gals.; 25 Liters)

    Gear Housing Lubricant Capacity 22.5 fl. oz. (665.2ml)

    Gasoline/Oil Ratio at Idle 80:1

    Gasoline/Oil Ratio at W.O.T. 50:1

    Gear Ratio 2.07:1

    Oil Injection Tank Capacity

    Tank Capacity 1.4 gal. (5.3 liters)

    Maximum operation per tank full of oil at W.O.T.

    5 hours

    Oil remaining when warning buzzer sounds

    1 qt. (.95 liter)

    Operating time remaining at wide open throttle when warn- ing buzzer sounds

    50 min. approx.

    *Improves running quality between 1800 – 2000 RPM.

  • 90-13645--2 495 1-3GENERAL INFORMATION AND SPECIFICATIONS

    Cowl Removal Pull outward on starboard side of front shield (a).

    Remove spring (b) from latch and open cowls.

    18291

    a

    18292

    b

    Filling Oil Injection System Open starboard cowl (refer to cowl removal on this page). Some earlier outboards will have a cowl brack- et to hold cowl open as shown.

    Fill tank with recommended oil.

    a

    a - Oil Tank Tube

  • 1-4 90-13645--2 495GENERAL INFORMATION AND SPECIFICATIONS

    Power Trim System GENERAL INFORMATION

    The power trim system is filled at the manufacturer and is ready for use.

    Trim outboard through entire trailering range several times to remove any air from the system.

    The trim system is pressurized and is not externally vented. The outboard can be raised or lowered manu- ally by loosening the manual release valve four turns.

    The trim “out” angle of this outboard is not adjustable. The trim system has an internal valve which will automatically stop the outward trim travel at 20� when engine RPM is approximately 2000 RPM or higher; outboard also has to be in water and in gear.

    The outboard can be operated beyond the 20� trim limit for operating outboard in shallow water if engine RPM is kept below approximately 2000 RPM.

    a

    b

    23321

    a - Fill Screw (System is Pressurized, DO NOT Open Unless Outboard is Tilted to Full Up Position)

    b - Manual Release Valve

    Trim “In” Angle Adjustment MODELS WITH POWER TRIM

    WARNING Operating some boats with outboard trimmed to the full “in” trim angle [not using trim adjustment bolt (a)] at planing speed will cause undesirable and/or unsafe steering conditions. Each boat MUST BE water tested for handling characteristics after outboard installation and after any trim adjust- ments.

    IMPORTANT: Some boat/motor combinations, that do not use the trim adjustment bolt (a) and are trimmed to the full “in” trim angle, will not experi- ence any undesirable and/or unsafe steering conditions during planing speed. Thus, not using trim adjustment bolt may be desired. However, some boats with outboard trimmed to the full “in” trim angle at planing speeds will cause undesir- able and/or unsafe steering conditions. If these steering conditions are experienced, under no circumstances should the outboard be operated without the trim adjustment bolt and without the bolt adjusted in the proper holes to prevent un- safe handling characteristics.

    Water test the boat not using the trim adjustment bolt. If undesirable and/or unsafe steering conditions are experienced (boat runs with nose down), install trim adjustment bolt in proper hole to prevent unsafe han- dling characteristics.

    22744 a

  • 90-13645--2 495 1-5GENERAL INFORMATION AND SPECIFICATIONS

    Checking Trim System Fluid Level IMPORTANT: This trim system is pressurized. Remove fill screw (b) when outboard is trimmed to the full “up” position. Retighten fill screw securely.

    1. Trim outboard to full “up” position. Engage tilt lock lever. Trim system fluid can only be checked when outboard is in this position.

    2. Remove fill screw and check fluid level. Fluid level should be visible in fill tube.

    3. If necessary, add Quicksilver Power Trim and Steering Fluid; or Automatic Transmission Fluid (ATF) Type F, FA or Dextron II.

    20319

    a

    b

    a - Tilt Lock Lever b - Fill Screw

    Tilt Angle Adjustment MODELS WITHOUT POWER TRIM

    WARNING Operating some boats at minimum trim “In” at planing speeds will cause undesirable and/or unsafe steering conditions. Each boat should be tested for handling characteristics after any adjustment is made to the tilt angle.

    DO NOT OPERATE motor with tilt lock pin removed.

    Adjust tilt angle of motor on transom with tilt lock pin so that anti-ventilation plate is about parallel and even with bottom of boat. Speed sometimes may be im- proved by tilting motor out one tilt pin hole to raise bow and reduce wetted surface. If motor is tilted in, boat will ride bow down, wetting more of the bottom and re- ducing speed, which generally will improve operation in rough water. Under ideal conditions, efficiency is best with lower unit operating in level position. Opera- tion with excessive tilt angle will reduce performance noticeably and may induce ventilation. It is preferable to level boat by proper loading rather than by extreme adjustment of tilt angle.

    22744

    a

    a - Tilt Lock Pin

  • 1-6 90-13645--2 495GENERAL INFORMATION AND SPECIFICATIONS

    Connecting Eng